We went behind the scenes of Wicked and saw its 4,500 piece wardrobe

Alice Fearn who plays the Wicked Witch showed us how her green makeup is applied.

The make-up process takes about 25-30 minutes.

We also saw the "wardrobe village" which stores 4,500 costume pieces.

We went behind the scenes of the musical Wicked in London to see how the Wicked Witch turns green and visit their "wardrobe village".

We spoke to Alice Fearn who plays Elphaba and has her face is painted green before every show.

"It does really look like your skin colour," the actress told Business Insider. "It looks like it can't really be paint, in a way. The closer I go to the front of the stage, you see people really trying to work out where the line is".

For the makeup, they use a water-based product from MAC which is applied on Alice's face, neck, and shoulders. It's retouched with a very thick foundation to smooth it out and powder to dry it out.

"If you sweat, or a get a bit hot, then that is what can start bringing it off. It's got to be as dry as possible", said Fearn.

We were also allowed in the musical's "wardrobe village" which stores 4,5000 costume pieces. In the show, there are 128 hats, 241 pairs of shoes, and over 130 jewellery pieces.

The most elaborate costume is the Bubble dress which is worn by Glinda the Good Witch.

"It's made up of layers of crinoline and it has 36 petals on it," wardrobe assistant Hannah Wratten told Business Insider. "Each of the petals takes two days to sequin".

"There over 20 types of sequin on the dress. That makes up over 100,000 sequins on the dress and bodice in total".